城市径流总量控制指标分解及实现路径探索与实践

针对海绵城市径流总量控制目标,提出一种在城市规划体系中控制性详细规划和修建性详细规划阶段分解落实年径流总量控制率的方法。在控制性详细规划阶段分解径流总量控制指标时,分步骤先后确定各项低影响开发措施的面积率和下沉深度;在修建性详细规划阶段,配合径流总量控制指标分解结果,给出适宜的各项低影响开发措施的技术实施导则,以保证各单项指标的正确实施,并以某项目为例介绍了技术实施导则的构建方法。     

高流态大掺量粉煤灰混凝土的研制及应用

通过混凝土配合比的正交试验及有关因素影响效果的分析,确定了高流态大掺量粉煤灰混凝土配合比的最优方案,进而成功用于最深的混凝土防渗墙工程中,为高流态大掺量粉煤灰混凝土的广泛应用提供了参考。     

碰撞检测技术研究综述

碰撞检测在图形学、仿真、动画和虚拟现实等技术中得到广泛的研究,这些研究具有十分重要的意义。文章对二维空间中多边形等面模型间相交,以及三维空间中多面体等体模型间干涉的角度对碰撞检测技术的研究和发展作了较为全面的论述,并对几种常用的碰撞检测算法进行了分析和比较,最后对碰撞检测算法的发展方向提出了几点建议。     

Free volume in two differently plasticized poly(vinyl chloride)s: a positron lifetime and PVT study

The temperature dependence of the specific volume, V, and of the mean size of local free volumes (holes), v_h, of poly(vinyl chloride) containing 10 wt% (PVC-h) and 30 wt% (PVC-s) of the plasticizer di-n-butyl phthalate (DBP) were studied by pressure-volume-temperature (PVT) and positron annihilation lifetime spectroscopy (PALS) experiments. Using the Simha-Somcynsky equation-of-state, the hole fraction h was calculated from the PVT data. It was found that the thermal expansivity of the specific volume V, the specific free volume V_f=hV, and v_h increase with the content of plasticizer. From the comparison of V and V_f with v_h the hole number per gram N′_h is estimated. Other than v_h, N′_h does not depend on the temperature nor on the content of plasticizer.     

焦炭煅烧回转窑技术参数的讨论和锥形回转窑的设计构思

通过对焦煅烧回窑的一些设计和运行参数的讨论，论述了锥形回转窑的设计及其使用的可行性和优越性。     

A STUDY OF SILICONE OIL-IN-WATER EMULSIONS

Emulsions of silicone oil-in water were formed using a Brinkmann Polytron homogenizer with Igepal CO-530 as an emulsifier. Silicone viscosities ranged from 10 to 33,000 mPa.s at 25°C. Rheological characteristics and particle size analyses of silicone oil-in-water emulsions were studied. At high volume fraction of the dispersed phase (70%-75%), silicone oil-in-water emulsions were stable. At lower volume fractions (50%-60%), emulsions formed were less stable and the two phases easily separated in a few days. The emulsions formed with high volume fraction silicone oil show highly non-Newtonian behavior (shear thinning). Emulsions made with low viscosity oils had lower viscosities than those made from high viscosity oils. Relative viscosity-concentration data could be correlated by the Frankel and Acrivos Equation. Increasing the emulsifier concentration of 70% oil-in-water emulsions resulted in a decrease in mean droplet size and an increase in emulsion viscosity. Increasing the intensity of agitation also resulted in higher viscosity and smaller droplet size until a critical energy input above which droplet size increased. Emulsification with low shear mixing provides more control in decreasing mean droplet size with time.     

顺序共注射成型充填过程的数值模拟

基于Hele Shaw流动模型,推导出顺序共注射成型充填过程的数值模型;并引入厚度分数,采用控制体积法来实现运动界面的追踪。数值模拟结果与moldflow的模拟结果相吻合,并且能够正确反映芯皮层熔体黏度比对注射压力和界面形貌的影响。     

Molecular simulation of hydrogen adsorption in organic zeolite

The adsorption of molecular hydrogen on model zeolites has been simulated employing Grand Canonical Monte Carlo (GCMC) procedure. The effects of cation type, available volume, surface area, temperature, pressure and pre-adsorbed organics such as benzene on the hydrogen uptake are analyzed. The hydrogen adsorption can be affected mainly by the available volume and surface area per g-zeolite at the same temperature and pressure. Increase of temperature results in the decrease of sorption intensity and capacity. The adsorption capacity correlates well with the pressure with high linearity at room temperature. Adsorption is lowered by the pre-adsorbed benzene molecule. The orientation and the number of benzene molecule in zeolite affect the adsorption capacity. The organic zeolite with larger available volume shows larger adsorption capacity.     

耐高温水蒸汽氟橡胶的研究

对四氟化乙丙橡胶（ＴＰ－２）和氟橡胶（ＦＫＭ－２４６Ｇ）进行了耐２８０℃水蒸汽试验。结果表明：以过氧化二异丙－三烯丙基异氰脲酸酯为硫化体系的ＴＰ－２硫化胶的耐高温水蒸汽性能，明显优于以Ｎ，Ｎ＇－双肉桂叉－１，６－己二胺为硫化体系的ＦＫＭ－２４６Ｇ硫化胶和以过氧化苯甲酰为硫化体系的ＦＫＭ－２４６Ｇ硫化胶。     

Synthesis and water absorbency of crosslinked superabsorbent polymers

A series of novel copolymer superabsorbents based on monomer acrylamide (AM), potassium methacrylate (KMA), and 2‐hydroxyethyl methacrylate (HEMA) were prepared by copolymerization using ammonium persulfate (APS) as an initiator and N,N‐methylenebisacrylamide (MBA) as a crosslinking agent. The synthetic variables (the monomer concentration, crosslinker concentration, and initiator concentration) were also studied. The experimental results of superabsorbent polymers (SAPs) show a better absorbency in both water and NaCl solutions. The copolymers were characterized by IR spectroscopy. The water retention in the soil was enhanced using the above superabsorbents. The use of SAPs for the growth of groundnut plants was also investigated. SAPs can be considered for water‐managing materials for agriculture and horticulture purposes in desert and drought‐prone areas. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1795–1801, 2002